:root{--ink:#11162e;--muted:#60667a;--accent:#563cff;--lavender:#f4f1ff;--line:#e1e3ec;--white:#fff;--radius:20px;color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;color:var(--ink);background:var(--white);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
button{font:inherit;cursor:pointer}
button:focus-visible,a:focus-visible,summary:focus-visible,video:focus-visible{outline:3px solid var(--accent);outline-offset:5px}
.wrap{width:min(1040px,calc(100% - 64px));margin-inline:auto}
.header{display:flex;align-items:center;justify-content:space-between;min-height:112px;border-bottom:1px solid var(--line)}
.brand img{display:block;width:156px;height:auto}
.header-label{font-size:13px;font-weight:500;color:var(--muted);display:flex;gap:9px;align-items:center}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}
.intro{padding:54px 0 36px;max-width:760px}
.eyebrow{font-size:11px;letter-spacing:.12em;font-weight:750;color:var(--accent);margin:0 0 17px}
h1{font-size:clamp(36px,5.1vw,58px);letter-spacing:-.045em;line-height:1.08;font-weight:750;margin:0 0 22px}
h1 span{color:var(--accent)}
.intro-text{font-size:18px;line-height:1.6;max-width:640px;color:var(--muted);margin:0 0 20px}
.intro-meta{display:flex;gap:15px;align-items:center;font-size:13px;font-weight:600}
.intro-meta a{color:var(--accent)}
.meta-divider{height:14px;border-left:1px solid #c4c6d4}
.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:17px}
.section-heading h2{font-size:20px;letter-spacing:-.025em;line-height:1.35;margin:0}
.section-heading>span{font-size:12px;color:var(--muted);white-space:nowrap}
.video-section{margin-top:4px}
.player-shell{position:relative;overflow:hidden;border-radius:var(--radius);background:var(--ink);border:1px solid var(--line);box-shadow:0 14px 44px #11162e0a;aspect-ratio:16/9}
video{display:block;width:100%;height:100%;object-fit:contain}
.play-cover{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;border:0;background:linear-gradient(0deg,#11162e65,#11162e08);color:white;font-size:15px;font-weight:700;text-shadow:0 1px 6px #11162e}
.play-icon{display:grid;place-items:center;padding-left:5px;width:78px;height:78px;border-radius:50%;font-size:25px;color:white;background:var(--accent);box-shadow:0 0 0 8px #ffffff2a;transition:transform .2s}
.play-cover:hover .play-icon{transform:scale(1.07)}
.play-cover[hidden]{display:none}
.player-caption{display:flex;gap:18px;align-items:baseline;justify-content:space-between;margin-top:14px;font-size:13px}
.player-caption p{margin:0;color:var(--muted)}
.player-caption a{white-space:nowrap;font-weight:600}
.mobile-tip{font-size:12px;color:var(--muted);margin:8px 0 0}
.player-message{padding:12px 16px;background:var(--lavender);font-size:14px;border-radius:10px}
.chapters{margin-top:24px;padding:0;border:1px solid var(--line);border-radius:14px}
.chapters summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 20px;font-size:14px;font-weight:650;cursor:pointer}
.chapters summary::-webkit-details-marker{display:none}
.chapters summary>span{font-size:22px;line-height:1;color:var(--accent)}
.chapters[open] summary>span{transform:rotate(45deg)}
.chapter-list{list-style:none;margin:0;padding:0 12px 12px;display:grid;grid-template-columns:1fr 1fr;gap:4px}
.chapter-list button{background:transparent;border:0;display:flex;align-items:center;gap:14px;text-align:left;padding:11px 10px;width:100%;color:var(--ink);font-size:13px;border-radius:8px;min-height:44px}
.chapter-list button:hover{background:var(--lavender)}
.chapter-list button>span{font-size:12px;color:var(--accent);font-variant-numeric:tabular-nums;font-weight:600}
.documents{margin-top:48px;scroll-margin-top:24px}
.document-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.document-card{display:flex;flex-direction:column;padding:25px;border:1px solid var(--line);border-radius:var(--radius)}
.express{background:var(--lavender);border-color:#ded6ff}
.document-top{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:var(--muted)}
.document-format{font-weight:700;letter-spacing:.04em;color:var(--accent);border:1px solid #dcd3ff;background:white;padding:3px 9px;border-radius:6px;font-size:11px}
.document-card h3{font-size:24px;letter-spacing:-.035em;margin:18px 0 8px;line-height:1.3}
.document-card p{font-size:14px;color:var(--muted);margin:0 0 24px;max-width:390px}
.document-actions{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:auto}
.button{display:inline-flex;align-items:center;justify-content:center;gap:17px;background:var(--accent);color:white;border:1px solid var(--accent);border-radius:10px;min-height:46px;padding:10px 17px;font-size:13px;font-weight:650}
.button:hover{text-decoration:none;background:#462fe0}
.button-outline{background:white;color:var(--ink);border-color:#cdd0de}
.button-outline:hover{background:var(--lavender)}
.download{font-size:12px;font-weight:600;min-height:44px;display:inline-flex;align-items:center;gap:8px}
.help{display:flex;align-items:flex-start;gap:17px;margin-top:38px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.help-mark{flex:0 0 28px;height:28px;border:1px solid #cfd1de;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:600;margin-top:2px}
.help h2{font-size:17px;letter-spacing:-.025em;margin:0 0 5px}
.help p{font-size:13px;color:var(--muted);margin:0;max-width:750px}
.official-links{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:13px;font-size:12px;font-weight:600;color:var(--accent)}
.official-links a{min-height:32px;display:inline-flex;align-items:center}
.guide-note{font-size:11px;color:var(--muted);margin:17px 0 0}
.footer{display:flex;justify-content:space-between;align-items:center;gap:24px;color:var(--muted);padding-top:34px;padding-bottom:34px;font-size:11px}
.footer a{font-weight:600;color:var(--ink)}
.skip-link{position:fixed;z-index:10;left:15px;top:-100px;background:var(--ink);color:white;padding:10px 20px;border-radius:8px}
.skip-link:focus{top:15px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:640px){.wrap{width:calc(100% - 36px)}.header{min-height:86px}.brand img{width:128px}.header-label{font-size:11px}.intro{padding-top:35px;padding-bottom:29px}h1{font-size:38px}.intro-text{font-size:16px}.intro-meta{font-size:12px;gap:12px}.section-heading{align-items:flex-start;gap:10px}.section-heading h2{font-size:18px}.section-heading>span{font-size:11px}.player-shell{border-radius:13px}.play-icon{width:54px;height:54px;font-size:19px;box-shadow:0 0 0 5px #ffffff2a}.play-cover{gap:8px;font-size:12px}.player-caption{display:block;font-size:12px}.player-caption a{display:inline-block;padding:9px 0;min-height:44px}.mobile-tip{margin-top:0;font-size:11px}.chapters{margin-top:20px}.chapters summary{font-size:13px;padding:14px 16px}.chapter-list{grid-template-columns:1fr}.documents{margin-top:35px}.documents .section-heading{display:block}.documents .section-heading>span{display:block;margin-top:6px}.document-grid{grid-template-columns:1fr;gap:14px}.document-card{padding:23px}.document-card h3{font-size:23px}.document-card p{font-size:13px}.help{margin-top:30px;gap:12px}.help h2{font-size:16px}.help p{font-size:12px}.official-links{gap:6px;flex-direction:column}.footer{display:block;padding:25px 0}.footer a{display:inline-block;margin-top:8px}.guide-note{font-size:11px}}
@media(max-width:360px){h1{font-size:33px}.header-label{font-size:10px}.brand img{width:115px}.intro-meta{gap:9px;font-size:11px}.document-actions{gap:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}